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Sequoia 1455 McDowell Blvd North Ste <br /> Petaluma,CA 949544 <br /> i <br /> Analytical (707)792-1865 <br /> FAx(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P401360 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/06/04 09 57 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4020010-EPA 5030B waters <br /> Blank 4020010-BLK1 Prepared&Anal ed 02/02/04 <br /> Tetrachloroethene ND 10 ugtl <br /> Tert-amyl methyI ether ND 1 0 " <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EBB) ND 0 50 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND l00 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tent-butyl ether ND l 0 " <br /> Methyl Cert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> ylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 6 83 600 114 84-122 <br /> Surrogate 12-Dichloroethane-d4 5 95 600 99 74-135 <br /> Surrogate Toluene-d8 627 600 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 93 600 99 86-119 <br /> Laboratory Control Sample(4020010-BSI) Pre ared&Analyzed 02/02/04 <br /> Tert-amyl methyl ether 5 11 1 0 ug/l 5 00 102 78-117 <br /> Benzene 5 23 050 5 00 105 81-118 <br /> Tert-butyl alcohol 997 20 100 100 60-147 <br /> Di-isopropyl ether 5 10 1 0 5 00 102 70-125 <br /> 1,2-Dibromoethane(EDB) 4 94 0 50 500 99 85-125 <br /> 1,2-Dichloroethane 5 12 050 500 102 77-126 <br /> Ethanol 226 100 100 226 55-200 Q-LIM <br /> Ethylbenzene 4 96 050 500 99 89-122 <br /> Ethyl Cert-butyl ether 5 30 1 0 500 106 71-120 <br /> Methyl tert-butyl ether 5 70 050 500 114 70-122 <br /> Toluene 4 85 050 500 97 84-119 <br /> Xylenes(total) 15 3 050 15 0 IO2 86-132 <br /> Surrogate Dibromofluoromethane 6 65 600 111 84-122 <br /> Surrogate 12-Dichloroethane-d4 5 78 600 96 74-135 <br /> Surrogate 7oluene-d8 6 16 600 103 84-119 <br /> Surrogate 4 Bromof7uorobenzene 611 600 102 86-119 <br /> Sequoia Analytical ytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> . of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 7 of 9 <br />